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Correlation gap in the optical spectra of the two-dimensional organic metal (BEDT-TTF)_4[Ni(dto)_2]
P. Haas, E. Griesshaber, B. Gorshunov +3
Optical reflection measurements within the highly conducting (a,b)-plane of the organic metal (BEDT-TTF)_4[Ni(dto)_2] reveal the gradual development of a sharp feature at around 20…
Comment on "Quantum Monte Carlo Evidence for Superconductivity in the Three-Band Hubbard Model in Two Dimensions"
H. Endres, W. Hanke, H. G. Evertz +1
In a recent Letter, Kuroki and Aoki [Phys. Rev. Lett. 76, 440 (1996)] presented quantum Monte-Carlo (QMC) results for pairing correlations in the three-band Hubbard model, which de…
Quantum Transition between an Antiferromagnetic Mott Insulator and Superconductor in Two Dimensions
F. F. Assaad, M. Imada, D. J. Scalapino
We consider a Hubbard model on a square lattice with an additional interaction, , which depends upon the square of a near-neighbor hopping. At half-filling and a constant value…
Critical Exponents of the Metal-Insulator Transition in the Two-Dimensional Hubbard Model
Nobuo Furukawa, Fakher F. Assaad, Masatoshi Imada
We study the filling-controlled metal-insulator transition in the two-dimensional Hubbard model near half-filling with the use of zero temperature quantum Monte Carlo methods. In t…
Insulator-Metal Transition in the One and Two-Dimensional Hubbard Models
F. F. Assaad, M. Imada
We use Quantum Monte Carlo methods to determine Green functions, , on lattices up to for the 2D Hubbard model at . For chemical potentia…
Stable Quantum Monte Carlo Algorithm for Calculation of Imaginary Time Green Functions
F. F. Assaad, M. Imada
We present a numerically stable Quantum Monte Carlo algorithm to calculate zero-temperature imaginary-time Green functions for Hubbard type models. We illustrate…